<body md-src-pos="0..15"><pre md-src-pos="0..15"><code md-src-pos="0..15"><span md-src-pos='0..4'/><span md-src-pos='4..7'>aaa</span>
<span md-src-pos='8..11'>~~~</span>
<span md-src-pos='12..12'></span><span md-src-pos='12..15'/></code></pre></body>
